Yes, 4/8 and 1/2 are equivalent, because 4/8 reduced to simplest form is 1/2.
9 is 18% of 50. So, 50 percent also written as 50% means 50 out of 100 parts. Since there are exactly two 50s in 100, fifty percent is the same number as one half. 50 percent=0.5 in but as a fraction, its 1/2.
Answer: B. I prefer the warranty that covers repair costs of a new car
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Step-by-step explanation:

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D
This is because the expression can be simplified to get the same result. -1+2log_4((1/4)x)